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X-ray spectra of the high-mass X-ray binary 4U 1700-37 using BeppoSAX, Suzaku, and RXTE observationsстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 17 мая 2016 г.
- Авторы: Elena Seifina, Lev Titarchuk, Nikolai Shaposhnikov
- Журнал: Astrophysical Journal
- Том: 821
- Год издания: 2016
- Издательство: University of Chicago Press
- Местоположение издательства: United States
- Первая страница: 23
- DOI: 10.3847/0004-637X/821/1/23
- Аннотация: We present an X-ray spectral analysis of the high-mass binary 4U 1700-37 during its hard-soft state evolution. We use BeppoSAX, Suzaku, and Rossi X-ray Timing Explorer observations for this investigation. We argue that the X-ray broadband spectra during all of the spectral states can be adequately reproduced by a model consisting of a low-temperature blackbody component, two Comptonized components which are both due to the presence of a Compton cloud (CC) that up-scatters seed photons of Ts1<=1.4 keV and Ts2<1 keV, and an iron-line component. Using this model, we find that the photon power-law index is almost constant, Γ1~2 for all spectral states. However, Γ2 shows behavior that is dependent on the spectral state. Namely, Γ2 is quasi-constant at the level of Γ2~2 while the CC plasma temperature kTe(2) is less than 40 keV; on the other hand, Γ2 is in the range of 1.3<Γ2<2 when kTe(2) is greater than 40 keV. We explain this quasi-stability of Γ during most of the hard-soft transitions of 4U 1700-37 in the framework of a model in which the resulting spectrum is described by two Comptonized components. We find that these Comptonized spectral components of the high-mass X-ray binaries 4U 1700-37 are similar to those previously found in neutron star (NS) sources. This index dependence versus both the mass accretion rate and kTe revealed in 4U 1700-37 is universal observational evidence for the presence of an NS in 4U 1700-37.
- Добавил в систему: Сейфина Елена Викторовна